Discover all the security risks and exploits that can threaten iOS-based mobile devices

iOS is Apple's mobile operating system for the iPhone and iPad. With the introduction of iOS5, many security issues have come to light. This book explains and discusses them all. The award-winning author team, experts in Mac and iOS security, examines the vulnerabilities and the internals of iOS to show how attacks can be mitigated. The book explains how the operating system works, its overall security architecture, and the security risks associated with it, as well as exploits, rootkits, and other payloads developed for it.

From what I have read so far in Hacking and Securing, it seems like it is more oriented at actually getting you to interact and hack the device. Overall, both were good reads, but I would suggest starting with Hacking and Securing unless you are familiar with C and enjoy the highly technical details.